Answer
$-\frac{\sqrt3}{2}$
Work Step by Step
Using the given formula and the known values: $\cos (10\pi/3)=2\sin (5\pi/3)\cos(5\pi/3)=2(-\frac{\sqrt3}{2})(0.5)=-\frac{\sqrt3}{2}$
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 14 Trigonometric Graphs, Identities, and Equations - Chapter Test - Page 969: 22
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